75% is the change from 24 to 42
Calculation steps:
[( 42 - 24 ) ÷ 24] x 100 = 75%
Formula
Percentage change = [(42 - 24) / 24] x 100
Subtract the new number by the original number
42 - 24 = 18
18 ÷ 24 = 0.75
0.75 x 100 = 75%
Example